title: Studies on the crystal structure of A1-(D-Tryptophan) insulin.
abstract: We have determined the crystal structure of A1-(D-Trp) insulin and discovered that it belongs to the trigonal system with space group R3. The parameters of the unit cell are a = b = 78.6 A, c = 50.0 A. A set of data for half a sphere reciprocal space to a spacing of 2.2 A were collected. The model was adjusted and refined by using a step-by-step approach and a stereochemically-restrained least squares program, assisted by manual revision based on the difference Fourier maps, to a final R-factor of 0.218. The main and side chains of both A1-D-Trp residues in the asymmetric unit are well ordered. The packing of A1-(D-Trp) insulin in the unit cell, the conformational differences with other insulin structures and its structure and function relationship have also been discussed.
authors.affiliation: Institute of Biophysics, Academia Sinica, Beijing, PRC.
authors.forename: Z L
authors.initials: ZL
authors.lastname: Wan
authors.forename: D C
authors.initials: DC
authors.lastname: Liang
mesh_terms: D003460:Crystallization; D007328:Insulin / Q000031:analogs & derivatives* / Q000737:chemistry; D008968:Molecular Conformation
chemical_list: D007328:Insulin; C049598:insulin, Trp(A1)-